Jeep cherokee 2000 Service Manual page 144

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3 - 108
8 1/4 REAR AXLE
DIAGNOSIS AND TESTING (Continued)
Condition
Loss Of Lubricant
Axle Overheating
Gear Teeth Broke
Axle Noise
Possible Causes
1. Lubricant level too high.
2. Worn axle shaft seals.
3. Cracked differential housing.
4. Worn pinion seal.
5. Worn/scored yoke.
6. Axle cover not properly sealed.
1. Lubricant level low.
2. Improper grade of lubricant.
3. Bearing pre-loads too high.
4. Insufficient ring gear backlash.
1. Overloading.
2. Erratic clutch operation.
3. Ice-spotted pavement.
4. Improper adjustments.
1. Insufficient lubricant.
2. Improper ring gear and pinion
adjustment.
3. Unmatched ring gear and pinion.
4. Worn teeth on ring gear and/or
pinion.
5. Loose pinion bearings.
6. Loose differential bearings.
7. Mis-aligned or sprung ring gear.
8. Loose differential bearing cap
bolts.
9. Housing not machined properly.
Correction
1. Drain lubricant to the correct level.
2. Replace seals.
3. Repair as necessary.
4. Replace seal.
5. Replace yoke and seal.
6. Remove, clean, and re-seal cover.
1. Fill differential to correct level.
2. Fill differential with the correct fluid type
and quantity.
3. Re-adjust bearing pre-loads.
4. Re-adjust ring gear backlash.
1. Replace gears. Examine other gears and
bearings for possible damage.
2. Replace gears and examine the remaining
parts for damage. Avoid erratic clutch
operation.
3. Replace gears and examine remaining
parts for damage.
4. Replace gears and examine remaining
parts for damage. Ensure ring gear backlash
is correct.
1. Fill differential with the correct fluid type
and quantity.
2. Check ring gear and pinion contact pattern.
3. Replace gears with a matched ring gear
and pinion.
4. Replace ring gear and pinion.
5. Adjust pinion bearing pre-load.
6. Adjust differential bearing pre-load.
7. Measure ring gear run-out. Replace
components as necessary.
8. Inspect differential components and replace
as necessary. Ensure that the bearing caps
are torqued tot he proper specification.
9. Replace housing.
XJ

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